RESUMO
Objective: The purpose of this study was to evaluate mean cephalometric measurements for a group of individuals of Afro-Brazilian descent using the Wylie-Johnson analysis, and to investigate the presence of sexual dimorphism. Methods: Thirty-six lateral radiographs of the head of African-Brazilians were used. Subjects were 10 to 14 years old and had clinically normal occlusion, all permanent teeth, and no history of orthodontic treatment. Results: Results for girls and boys were, respectively: SNA 88.31� and 89.68�; SNB 83.96� and 85.01�; ANB 4.44� and 4.69�; 1:1= 118.18� and 116.51�; FG-ST 16.47 mm and 16.12 mm; ST-Pmf 19.69 mm and 19.88 mm; Pmf-ANS 53.69 mm and 54.84 mm; Pmf-1�MS 21.83 mm and 20.64 mm; FG-Pg 108.19 mm and 108.45 mm; FPL ?MPL 27.48� and 27.65�; TAFH 111.06 mm and 112.26 mm; UAFH 45.26 mm and 45.38 mm; LAFH 65.80 mm and 66.88 mm; FG-FPL 1.069 mm and -2.086 mm; MBL 70.24 mm and 69.67 mm; MRH 51.89 mm and 53.70 mm; gonial angle 129.27� and 129.28�. Results of Student?s-t test (?=5%) did not show any sexual dimorphism. Results of descriptive statistics were similar for the individuals of Afro-Brazilian descent in the study. Conclusion: Individuals of African descent had bimaxillary protrusion, a more acute interincisal angle, a larger inferior facial height, and a markedly convex profile.
Objetivo: Avaliar as medidas cefalom�tricas m�dias para um grupo de indiv�duos melanodermas usando a an�lise de Wylie & Johnson e tamb�m investigar a presen�a de dimorfismo sexual. M�todos: Foram usadas 36 telerradiografias em norma lateral de indiv�duos melanodermas, entre 10 e 14 anos de idade, com oclus�o clinicamente normal, todos os dentes permanentes e sem hist�rico de tratamento ortod�ntico. Resultados: Os resultados para os sexos feminino e masculino foram respectivamente: SNA = 88,31�?e 89,68�; SNB = 83,96�?e 85,01�; ANB = 4,44�?e 4,69�; 1:1= 118,18�?e 116,51�; FG-ST = 16,47mm e 16,12mm; ST-Fpm = 19,69mm e 19,88mm; Fpm-Spna = 53,69mm e 54,84mm; Fpm-6 = 21,83mm e 20,64mm; FG-Pg = 108,19mm e 108,45mm; PlF.PlM = 27,48� e 27,65�; AFAT = 111,06mm e 112,26mm; AFAS = 45,26mm e 45,38mm; AFAI = 65,80mm e 66,88mm; FG-PlF = ?1,069mm e ?2,086mm; Go-Me = 70,24mm e 69,67mm; Con-Go = 51,89mm e 53,70mm; Gon = 129,27? e 129,38?. A an�lise estat�stica descritiva dos dados mostrou homogeneidade entre os mesmos. N�o foi observado dimorfismo sexual (teste t de Student, ?=5%). Conclus�o: Os dados sugerem que os indiv�duos melanodermas estudados apresentam biprotrus�o maxilar, �ngulo interincisal mais agudo, altura facial inferior maior e perfil convexo acentuado.